/**
 * Copyright 2009 Friedrich Schäuffelhut
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 */
package de.schaeuffelhut.jdbc.txn;

import java.sql.Connection;

public abstract class ThreadLocalTransactional<T> implements Transactional<T>
{
	private final static ThreadLocal<Connection> threadLocalConnection = new ThreadLocal<Connection>();
		
	public static Connection getConnection()
	{
		if ( threadLocalConnection.get() == null )
			throw new RuntimeException( "no thread local connection, not in transaction" );
		return threadLocalConnection.get();
	}


	public T run(TxnContext context) throws Exception
	{
		threadLocalConnection.set( context.getConnection() );
		try
		{
			return run();
		}
		finally
		{
			threadLocalConnection.remove();
		}
	}

	protected abstract T run() throws Exception;
}
